./a.out < wait4.txt &
./a.out < wait4.txt &
./a.out < wait4.txt &
./a.out < wait4.txt &
./a.out < wait4.txt &
./a.out < wait4.txt &
./a.out < wait4.txt &
./a.out < wait4.txt &
./a.out < wait4.txt &
./a.out < wait4.txt &
./a.out < wait4.txt &
./a.out < wait4.txt &
./a.out < wait4.txt &
./a.out < wait4.txt &
./a.out < wait4.txt &
